Knife sharpener for slicing machines



Aug. 12, 1930.

w. J. CAMPBELL KNIFE SHARPENER FOR SLICING MACHINES Filed July 8. 1927 2 Shouts-Sheet 1 Aus 12, 1930. w. J. CAMPBELL 1,772,704

KNIFE SHARPENER FOR SLICING MACHINES Filed July 8, 1927 2 Sheets-Sheet 2 y MQW Patented/Aug. lf2, 19730 WILLIAM J. cAnrBnLL, or1 INDIANAPLIS, IDANA'; 4ASSIG1W`ony To linmean `11m MAGHINE COMPANY, 0F CnIAGQ-JLLrNs; Aroonronlyrron ory NWYoni;

lipncationilmedfruly 8,3192@ serial Noarzgzo.

invention `relates to ka fslicingllrn:aehine, i' `havinga rotary knifeand relates particularf,

lyv tofmeans for sharpeningysaid knife in responseto the rotationthereof;QA `Aparticular s purpose is the provision ,ofJgrindingyor kvsharpening means which shall be effective; to f sharpen the knife, whil'e preventing the formation of aburr upon the knifeiedge.r Anf other object is theprovision l of p sharpening means including opposed f grinding and burr removinggmembers yorroppositesides of l ther knife.Y Ain'othexpnrposeis the provision ofy suchl opposed sharpening and burr-removing l means, and means lfor effecting=the-engagey 15 ment ofl said burr remover prior tothe en gagement of said :grinding membergfanfd for t holding' said burrv remover f in engagement with" the knife until? afterthe grinding rneini ber is :removed Vfrom"operati've engagement f' theIeWith;` n Y a i i ff.

, I illustrateimy inventionlrrnore "or 4less die? l graininatically"ins:thedrawingsfvvhereinfkv x v Figure 1 is an elevationgffz, if: 1 Figure- `2,* is a 4:section on zthefline :iQ-, 'Q'of l Figure'1;f, :l l 'i Figure' 3 is vanlevation v*of the sharpening f assenfrlbly;`

V4*Figure 6 n Figuregand n l L v 1 e e Figure 'Tisanillustrationfon an-` enlarged v scale,1with relation of the grindingand fburr reinovinglmernbers totheknifeiedge'; x

throughout `:the specificationl andy drawings:` i

' A' generally indicates any..suitablebasej frame or`1nember,=provided forexaniple With, the supportillgstuds A71.

l belt BQ vherein shown asfof triangular feross, section,` to1.engagethefinclinedafacedi'channel Blfon the p`ulleyjl3l 1. G isaa f'knifef supporting sleeve mounted on*y the base A and including the kishield,".'poijtion7 C?. Mounted *Within Ythe sleevelportion Cris* ed'y vfor axial movementtherealong/ isA the libl;

indicates an 'oil `,duct extending throughv said? 'engaging surfacefHs. ThenieinberHisfr "j 'Qcessqd- 'at themed/Lend as"k atntgfengag the p which seats 'ina "recessE i`inl l theI Wallffofthesleeve y j VH j" is" single vf ing` ball, interposed between the 'of the"` l 'j meinbeAH and the innerenfd ofthe Aliloflllivwy the inner/sleeve? mounted "the ball bearing tracks :D1 to support 'the kballs' D2` opposed toitheinn'er vtracks `De on the..I knife` shaft D4. D5 are lockingVv nuts whereby to vst e'cure thefknife shaft and f roller bearing? together, the shaft Dt beingV enlarged as ati 55"' D6 'to engage the inner forwardball track' E is the :knife disc proper, secu'iedto the Sha-fb @SSG/111191 for example by lthe serewiE?, andfadditiona 1yV secured vto the' pulley' B?, for example bythe screws vi"lheknifedisciso shown as convex and is peripherally cut awa or recessed on its` hollowf face' 'as at E2 to. 1i t a peripheral portion E5 proj ecting somewhat-v forward from` theface ofthe knifeff Y, rL Referring vto Figure` 2 G p generally in'di- Cates f a Sharpener #housing having aff cover 1 platev G1. Integralvvith thek housing member` f G, as shown in Figure 51,1is'theinwardlypro-E jecting tubular bearingmemberG2.` Moun't-` 70 loW pusher or plunger Vsleeve G3 hereinfshownf asinteg'ral with the generallyslotted .portion L G*y to which is secured the external handle'Gif G-B' isafsecuring screw for said handle andG7 screw-` and through the member G4 to thefcen-r1;

grinder shaft lHf Whichis secured tok therp'rl'end fw of the cupped i grinding element H11 With the".4

centerofthe sleeve G?. It `will be undeij'stoodf?y thatthecombined plungereleinentG? Grrrrayv Y sle`eve-G2L i Itisgn'ofrmally held inwithdrawn?l v p Y positionl by Qtlfel spr-ing HWHvhi'eh is Y:coines' pressed "between thefivnside offthe housing; G landthe 'oollaryHl1 on-the member GBG. e The f L member" Hfisrlaterally expandedI as"atH7*? in:-

order to engagefthe outer face of the1 ih ousing Y 1 Gyto limit lthefiovenient ofthe gnindingfelrf ll' A Siiv central aperture'` H2 and Vthe f annular knife f ments in response to expansion of the spring V tiallyless strength than the spring H1".

. threaded stem K and the lock' nut K1".

fs ring rather than as Secured as at K K1 is a pin K upon which rotates the lever generally indicated as K'. It includes the lever arms K* K, each with the inward projectionK5 adapted to engage the member H11 on the push plunger G G. K is a lever arm to the end of `which is adjustably secured themember K7 cupped as at Ka to engage the rounded end J 3 of the shaft J1. The member K'I isshownas adjustable for example by means of the screw- 1(12 is any suitable oiling duct extending to the sleeve J.

It will be realized that whereasI have described and shown a practical and operative device nevertheless many changes might'be made in the size, shape, number and disposition of parts without departing from the s irit of my invention. I therefore wish my escription and drawings to be taken asin a broad sense illustrative and diagrammatic showing.

The use and operation of myinvention are as follows The grinding member H1 isnormallyheld in withdrawn position by the laction of .the spring H1. he operator, by thrusting against the handle G, may compress the a' inst the handle G". The grinder grindsy o the bevel side of the knife. When the grinder is thus thrust against the knife, if means were not em loyed to prevent it a burr would form at the nife edge, tending to curl over on the opposite side of the knife. In

order to revent the formation of such a burr I provi e the burr removing membenJ,

whlch mayfor example be a steel disc. The

burr remover is normally held out of contact with the knife, also in response to the actlon of the spring H, by means of the lever member K` and the member K7 mounted at the end thereof. VThe member K" engages `the positivlythereagainst by the action of the .1 against the lever arms K through t e enggement of the inward projections limiting me to my specific `thecollar H11. VWhen a positivel stances can the burr remover engage the knife until a'thrust on thehandle G5 overcomes the sprin H1 and 1permits the spring J 7 to move the s aft J1. so proportion the .parts,.however, that the burr removing disc J 2 willi contact the knife blade before the grindin member- H1 contacts the opposite side. lso the burr remover is not with-k drawn from the knife until after the grinding member is withdrawn. It thus results that the burr remover engages the knife priorr tothe grinding member, and is withdrawn from it only afterthe grinding member is withdrawn.

Furthermore the thrust of the burr remover against the knife is fixed, and is en tirely out of the control of the operator. In practice this is a considerable advantage, since the burr remover, orthe thrust of the spring which controls it, may be set or con trolled at the factory at the proper stren hi to remove the burr, andthe careless user as no opportunity to exert an unnecessarily strong thrust against the knife.

The angularity of the (grinding and burr removing elements towar s the rotary knife E is illustrated in Figures 2, 5 and 6, the pur,V pose ofwhich is to have each sharpening element contact the knife only at one point. As indicated in Figure 7, the grinding mem'-V ber H1 when in operation, touches the knife atthe point X and the burr removing disc J 2 contacts the knife at the point Y, thereby rotating the Ysharpening elements in the directions as shown by arrows in Figures 1 and 7. In practice I have found the angles most suitable to give the desired `results for the grinding member I-I1 to be12" both in the vertical and horizontal lane, Yfor the burr removing disc Jz to be llin the horizontal plane and3 30 in the vertical plane.

the term burrremover, I wish to lierentiate'between the member J 2 and the ordinarygrindinir member such as H1 the grindin member beingof any'suitable abrasive su stance, the burr remover being preferably nonabrasive'orat least less` abrasive than the grinder. The purpose for so providing is that the'burr remover maybe applied to the edge of thegknife before, during and after the grinding operation proper; without grinding down Yor wearing the knife edge to Ils les

any substantial degree. InT practice a steel y discmay be employedor any other substance which in relation to anv abrasive, may be described assmooth., The term is used relatively in the claims, and is not intended tol lamp` limit me tok any specific degree of smoothness but merely to point outthata member is employed lWhich does not substantially grind or exert a grinding action against the knife edge. i

The mere positioning of a burr remover,

such as a steel disc, in the plane of the knife edge and against the knife edge, presents to the burr Which is turned over bythe grinding a member which is rigid in its own plane and iwhich thrusts the burr back into the plane of the cutting edge of the knife. This is in contrast to the emplo ment of a grinder Which actually grinds o A the opposed facek of the knife. Thefsteel disc may shearofi` Y the burr, if the burrfis loose or Weak, and if it is not it moves it back into the knife plane.

' I claim: Y

l. In association with a slicing machine having a rotary knife andmeans'for driving it, a` burr removing member `mounted yfor engagement With 'one side of said knife, a grinding member mounted foriengagement With the opposite sideof said knife, yielding means urging said burr removing memberto- Ward said knife, means for moving said grinding memberl toward said knife, and means controlled by said grinder-moving means fornormally restraining said yielding means, butfreeing it upon initial movement of said grinder-moving means, whereby said burr removing member may engage said knife in advance of said grinder member,

Vsaid structure including kunitary mounting means for the burr removing and the grinding members, including'the lever adapted '-to be actuated in unison Witha movementof the grinding member toward or away from the knife, and an actuating` connection rbetween said lever rand the burr removing member.

2. The structurel ofclaim l characterized by the provision of-yieldingmeanslfor holding said lever normally in yposition tooppose the movement of the burr/removing member toward the knife.

Y 3. The structure,r ofclaim 1 characterized by the provision o fyielding means Vforfholding said lever normally insposition toy oppose the movement of the y,burr removing member towardgrthe' knife,'-said last mentioned yielding means urging 'the' burr removing member toward the knife. 1 y

Signed at Indianapolis, county "of ,Marion4 and7State of Indiana, this 29th day of June, 192,. f i *Y 

